| Day 1 (History) | Day 2 | Day 4 | Day 5 | |
|---|---|---|---|---|
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First to theorize about the existence of the atom was who?
Democritus
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What is atomic mass?
The mass of an atom.
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What is an ion
An atom or group of atoms that has a positive or negative charge.
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What is the way a atomic mass is measured?
AMU, atomic mass units.
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What is Avargadro’s number?
6.022e23
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What are the for major postulates of Dalton? (Name two)
a. All elements are composed of indivisible particles called atoms. b. Atoms of the same element are identical. c. Atoms combine in whole number ratios. d. Chemical reactions occurs when atoms separate, join, or rearrange.
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What is atomic number?
The weighted average of all an element ‘s isotopes.
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What is a cation?
Group of atoms with a positive charge.
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What is needed to find the Atomic mass?
Stable isotopes, mass of each, and natural abundance of each.
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What is a mole?
The amount of atoms in an element.
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What did the Gold Foil experiment discover?
The nucleus (a small, dense center to an atom)
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If you have equal protons as neutrons , what is the charge?
Neutral
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What is an anion?
Group of atoms or atom with a negative charge.
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What is the equation for Atomic Mass?
Isotope(1)x(%).+ Isotope(2) x (%)
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What is a molar mass?
the mass of a given substance divided by the amount of substance
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Who discovered the electron?
J. J. Thomson
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What is an isotope?
Element with same number of protons but different amount of electrons, giving a greater mass number.
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When an electron is lost, what does an atom become?
A cation.
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What is the average atomic mass!
Sum of the masses of isotopes.
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What is a nuclide?
distinct kind of atom or nucleus characterized by a specific number of protons and neutrons.
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Which of Dalton’s postulated are incorrect?
a. Atoms are divisible. b. Not all elements are identical (isotopes)
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What is the mass number?
Protons and neutrons in an atom.
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When an electron is gained, what does the atom become?
An anion
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What is an example of a real world problem where you would use a similar equation?
Weighted grade average.
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What does the mole bridge?
Atomic and microscopic worlds, allows transfer from atoms to grams.
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